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    console.log(12347); // 十进制 => 0 1 2 3 4 5 6 7 8 9  => 10
    console.log(0b11);  // 二进制(ES6)  => 0 1  => 10  (binary)
    console.log(0o11);  // 八进制(ES6)  => 0 1 2 3 4 5 6 7  => 10  (octal)
    console.log(0x11);  // 16进制  => 0 1 2 3 4 5 6 7 8 9  a b  c d e f  => 10  (x)


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